scholarly journals Studies on Bacillus sphaericus toxicity-related resistance development and biology in the filariasis vector, Culex quinquefasciatus (Diptera: Culicidae) from South India.

2002 ◽  
Vol 37 (3) ◽  
pp. 365-371 ◽  
Author(s):  
Subbiah Poopathi ◽  
Brij K. Tyagi
Keyword(s):  
Culex Quinquefasciatus ◽  
South India ◽  
Bacillus Sphaericus ◽  
Resistance Development ◽  
Filariasis Vector

Efficacy of Bacillus sphaericus in control of the filariasis vector Culex quinquefasciatus in an urban area of Olinda, Brazil

2000 ◽  
Vol 94 (5) ◽  
pp. 488-492 ◽  
Author(s):  
L. Regis ◽  
C.M.F. Oliveira ◽  
M.H. Silva-Filha ◽  
S.B. Silva ◽  
A. Maciel ◽  
...  
Keyword(s):  
Urban Area ◽  
Culex Quinquefasciatus ◽  
Bacillus Sphaericus ◽  
Filariasis Vector

scholarly journals Occurrence of L1014F and L1014S mutations in insecticide resistant Culex quinquefasciatus from filariasis endemic districts of West Bengal, India

2022 ◽  
Vol 16 (1) ◽  
pp. e0010000
Author(s):  
Priyanka Rai ◽  
Dhiraj Saha
Keyword(s):  
Culex Quinquefasciatus ◽  
West Bengal ◽  
Economic Status ◽  
Minor Role ◽  
Resistance Development ◽  
Vector Population ◽  
A Minor ◽  
First Time

Introduction Lymphatic filariasis causes long term morbidity and hampers the socio-economic status. Apart from the available treatments and medication, control of vector population Culex quinquefasciatus Say through the use of chemical insecticides is a widely applied strategy. However, the unrestrained application of these insecticides over many decades has led to resistance development in the vectors. Methods In order to determine the insecticide susceptibility/resistance status of Cx. quinquefasciatus from two filariasis endemic districts of West Bengal, India, wild mosquito populations were collected and assayed against six different insecticides and presence of L1014F; L1014S kdr mutations in the voltage-gated sodium channel gene was also screened along with the use of synergists to evaluate the role of major detoxifying enzymes in resistance development. Results The collected mosquito populations showed severe resistance to insecticides and the two synergists used–PBO (piperonyl butoxide) and TPP (triphenyl phosphate), were unable to restore the susceptibility status of the vector thereupon pointing towards a minor role of metabolic enzymes. kdr mutations were present in the studied populations in varying percent with higher L1014F frequency indicating its association with the observed resistance to pyrethroids and DDT. This study reports L1014S mutation in Cx. quinquefasciatus for the first time.

Ultrastructural analysis of midgut cells from Culex quinquefasciatus (Diptera: Culicidae) larvae resistant to Bacillus sphaericus

Micron ◽  
2008 ◽  
Vol 39 (8) ◽  
pp. 1342-1350 ◽  
Author(s):  
Janaina Viana de Melo ◽  
Romero Henrique Teixeira Vasconcelos ◽  
André Freire Furtado ◽  
Christina Alves Peixoto ◽  
Maria Helena Neves Lobo Silva-Filha
Keyword(s):  
Culex Quinquefasciatus ◽  
Bacillus Sphaericus ◽  
Ultrastructural Analysis

scholarly journals Transcriptomic analysis of insecticide resistance in the lymphatic filariasis vector Culex quinquefasciatus

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Walter Fabricio Silva Martins ◽  
Craig Stephen Wilding ◽  
Alison Taylor Isaacs ◽  
Emily Joy Rippon ◽  
Karine Megy ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
Lymphatic Filariasis ◽  
Culex Quinquefasciatus ◽  
Transcriptomic Analysis ◽  
Filariasis Vector

Single nucleotide deletion of cqm1 gene results in the development of resistance to Bacillus sphaericus in Culex quinquefasciatus

2013 ◽  
Vol 59 (9) ◽  
pp. 967-973 ◽  
Author(s):  
Qing-yun Guo ◽  
Quan-xin Cai ◽  
Jian-ping Yan ◽  
Xiao-min Hu ◽  
Da-sheng Zheng ◽  
...  
Keyword(s):  
Culex Quinquefasciatus ◽  
Bacillus Sphaericus ◽  
Single Nucleotide ◽  
Single Nucleotide Deletion ◽  
Nucleotide Deletion ◽  
Development Of Resistance

scholarly journals Conjugal Transfer of a Toxin-Coding Megaplasmid from Bacillus thuringiensis subsp. israelensis to Mosquitocidal Strains of Bacillus sphaericus

2006 ◽  
Vol 72 (3) ◽  
pp. 1766-1770 ◽  
Author(s):  
Katherine Gammon ◽  
Gareth W. Jones ◽  
Steven J. Hope ◽  
Cláudia M. F. de Oliveira ◽  
Lêda Regis ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Vegetative Growth ◽  
Bacillus Sphaericus ◽  
Conjugal Transfer ◽  
Large Plasmid ◽  
Erythromycin Resistance ◽  
Plasmid Loss ◽  
The Stability

ABSTRACT Both Bacillus sphaericus and Bacillus thuringiensis subsp. israelensis produce mosquitocidal toxins during sporulation and are extensively used in the field for control of mosquito populations. All the known toxins of the latter organism are known to be encoded on a large plasmid, pBtoxis. In an attempt to combine the best properties of the two bacteria, an erythromycin resistance-marked pBtoxis plasmid was transferred to B. sphaericus by a mating technique. The resulting transconjugant bacteria were significantly more toxic to Aedes aegypti mosquitoes and were able to overcome resistance to B. sphaericus in a resistant colony of Culex quinquefasciatus, apparently due to the production of Cry11A but not Cry4A or Cry4B. The stability of the plasmid in the B. sphaericus host was moderate during vegetative growth, but segregational instability was observed, which led to substantial rates of plasmid loss during sporulation.

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